EP 0003710 B1 19810715 - PROCESS FOR PREPARING FERRITE POWDERS AND POWDERS OR PERMANENT MAGNETS SO PRODUCED
Title (en)
PROCESS FOR PREPARING FERRITE POWDERS AND POWDERS OR PERMANENT MAGNETS SO PRODUCED
Publication
Application
Priority
US 87635578 A 19780209
Abstract (en)
[origin: EP0003710A1] 1. A process to prepare ferrite powder having a magnetoplumbite structure in order to manufacture permanent magnets with high magnetic properties, by incorporating such a powder in a thermoplastic, thermosettable or elastomeric binder and orientating it by mechanic and/or magnetic means, process consisting of preparing a mixture of Fe2 O3 iron oxides and at least one carbonate of Ba, Sr, or Pb and calcining said mixture, characterized in that at least one alkaline or alkaline-earth halide in a total amount of 0.5 % to 15 % of the total weight said mixture, and at least one oxygenated boron compound, particularly an alkaline or alkaline-earth borate, in a total amount of 0.2 to 7 % preferably between 0.5 to 3 % of the weight of said mixture is added to said mixture and the mixture is calcined between 850 and 1100 degrees C (preferably between 900 and 1000 degrees C) for at least 15 minutes.
IPC 1-7
IPC 8 full level
C04B 35/26 (2006.01); H01F 1/11 (2006.01); C01G 49/00 (2006.01); H01F 1/117 (2006.01); H01F 7/02 (2006.01)
CPC (source: EP)
C04B 35/2683 (2013.01); H01F 1/117 (2013.01)
Designated contracting state (EPC)
DE GB NL SE
DOCDB simple family (publication)
EP 0003710 A1 19790822; EP 0003710 B1 19810715; AT 366020 B 19820310; AT A95979 A 19810715; BE 874057 A 19790809; BR 7900713 A 19790904; CA 1135081 A 19821109; CH 640667 A5 19840113; DE 2960466 D1 19811022; ES 477487 A1 19791016; IN 150524 B 19821106; IT 1110398 B 19851223; IT 7919973 A0 19790207; JP S54116399 A 19790910; JP S5632257 B2 19810727
DOCDB simple family (application)
EP 79420006 A 19790202; AT 95979 A 19790208; BE 193367 A 19790209; BR 7900713 A 19790206; CA 321097 A 19790208; CH 101379 A 19790202; DE 2960466 T 19790202; ES 477487 A 19790206; IN 16DE1979 A 19790110; IT 1997379 A 19790207; JP 1272979 A 19790206